Tyler Reddick’s June struggles have extended into July.
Reddick laid a large amount of oil down on the track after an apparent major issue on Lap 135 in the eero 400 NASCAR Cup Series race on July 5 at Chicagoland Speedway.
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The No. 45 started smoking and laying down oil going into turn 3 shortly after pitting during a green flag cycle.
Reddick stopped down on pit road, with oil and fluid all across the right side of the car and on the windshield.
A 23XI Racing crew member told TNT that “something went through the radiator” that caused the issue.
LIVE RACE UPDATES: NASCAR Cup Series Chicagoland race live updates, highlights, leaderboard
NASCAR threw a caution for a lengthy clean-up for fluid on the track. The No. 45 team worked to fix the radiator and related issues in the garage, returning to the track in 36th, 29 laps down.
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Reddick’s spectacular start to the 2026 season finally hit a road bump in June after a DNF at Michigan, a late-race tire failure at San Diego and a power-steering failure at Sonoma.
Denny Hamlin took the points lead from Reddick after Sonoma, the first week in which the 23XI Racing driver did not lead the standings.
This article originally appeared on Nashville Tennessean: Tyler Reddick suffers another setback with radiator issue in NASCAR Chicagoland race
